FLORIDA GEOLOGICAL SURVEY


temperature and mean annual water loss under such conditions
is shown in figure 7, which is taken from U. S. Geological Survey
Circular 52. For the Green Swamp area where the mean annual
temperature is 72' F., the annual water loss would be 48 inches
according to this figure.

 ENVIRONMENTAL FACTORS AFFECTING THE
 QUALITY OF WATER

 The quality of water in the Green Swamp area reflects the
solubility of the material which the water contacts and its biologic
environment, both of which are natural influences. Surface water
is usually lower in mineral content than ground water because of
low solubility of materials on the surface of the ground and short
time of contact of water with the materials.
 The quality of the surface water (lakes, streams, and swamps)
depends mostly on the composition of the precipitation and the


10 20


30 40


50 E0


 Natural water loss, in inches
Figure 7. Relation of annual water loss to temperature in humid areas.


 80




 70

u-
o

0 60

0.
E
 50
 a5



 40




 30
 30


 Polatlakaho Creek above Mascotte
 I I I /
 Withlacoochee River at Trilby-.













 SComputed annual water loss
 at two gaging stations in
 Green Swamp area.

 (After Longbein, W. B., and
 others, 1949)
______ _____ I